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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>用户按下键盘，显示keyCode</title>
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    body {
        text-align: center;
        font: 30px/1.5 \5fae\8f6f\96c5\9ed1, arial;
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    pre {
        color: green;
        padding: 10px 15px;
        background: #f0f0f0;
        border: 1px dotted #333;
        font: 12px/1.5 Courier New;
        text-align: left;
    }
    
    span {
        color: #999;
    }
    </style>
    <script type="text/javascript">
    window.onload = function() {
        var oP = document.getElementsByTagName("p")[0];
        document.onkeydown = function(event) {
            var event = event || window.event;
            oP.innerHTML = event.keyCode;
            return false
        }
    }
    </script>
</head>

<body>
    <pre>
&lt;script type="text/javascript"&gt;
window.onload = function ()
{
	var oP = document.getElementsByTagName("p")[0];	
	document.onkeydown = function (event)
	{
		var event = event || window.event;
		oP.innerHTML = event.keyCode;
		return false
	}
}
&lt;/script&gt;
</pre>
    <p>这里将显示您按下键的 keyCode</p>
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